Virtual users in sendmail (and vacation/.forward support?)

[Paul Dlug <paul@nerdlabs.com>]

I'm using sendmail with OpenLDAP integration to handle mail aliases and 
would like to support virtual user accounts (accounts are looked up in 
the LDAP server and mapped to a single local user with delivery via 
procmail). I'm not clear on how this is supposed to work, virtusertable 
seems to be designed to forward mail for a virtual host on to another 
system not deliver it locally. If anyone could provide some explanation 
or examples I would appreciate it.

Also, is anyone aware of a mechanism for supporting vacation messages 
and basic forwarding from LDAP? I'd like to provide an interface for my 
users to set an away message or forward their mail. It would be easy to 
write a quick web app to do this but I need the support in the MTA for 
it.


Thanks,
Paul